Guide number to lumens

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When setting photoflash exposures, the guide number (GN) of photoflash devices is a measure The total luminous energy (in lumen?seconds) emitted by the flash head Guide Number simply is the multiplied product of (flash distance x f/stop) for a proper exposure situation (normally specified for ISO 100). For example, if a Lumens measure the total amount of visible light given out. The higher the number of lumens, the brighter the light. At Intelect Lighting we provide this as a